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Fertilization happens when a sperm meets and penetrates an egg. It's also called "conception". At this moment the genetic moment is complete. Within about three(3) days of conception, the fertilized egg is dividing very fast into many cells. It passes through the fallopian tube into tha uterus, where it attaches to the uterine wall. The placenta which will nourish the baby, also start to form.

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At this point the baby is developing the structures that will eventually form their face and neck. The heart and the blood vessels continue to develop. And the lungs, stomach, and liver start to develop. A home pregnancy test would show positive.

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The baby is now a little over half an inch in size. Eyelids and ears are forming, and can see the tip of the nose. The arms and legs are well formed. The fingers and toes grow longer and more distinct.

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The baby measures about 2 inches and starts to make its own movements. It may start to feel the top of the uterus above pubic bone. The doctor may hear the baby's heartbeat with special instruments. The sex organ of the baby should start to become clear.

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The baby now measures about 4.3 to 4.6 inches and weighs about 3.5 ounces. Should be able to feel the top of the uterus about 3 inches below belly button. The baby's eyes can blink and the heart and the blood vessels are fully formed. The baby's fingers and toes have fingerprints.

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The baby's weighs about 10 ounces and is a little more than 6 inches long. Uterus should be at the level of the belly button. The baby can suck a thumb, yawn, stretch, and make faces. The baby move, which is called "quickening".

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An ultrasound is usually done for all pregnant woman at 20 weeks. During ultrasound, the doctor will make sure that the placenta is healthy and attached normally and that the baby is growing properly. Can see the baby's heartbeat and movement of it's body, arms, and legs on the ultrasound. Can usually find whether it's a boy or a girl at 20 weeks.

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The baby weighs about 1.4 pounds now and responds to sounds by moving or by increasing their pulse. May notice jerking motions if they hiccup. With the inner ear fully developed, the baby may be able to sense being upside down in the womb.

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The baby ways about 2 pounds, 6 ounces, and changes position often at this point in pregnancy. If it had to deliver prematurely now, there is a good chance the baby would survive. Now is the time to register for birthing classes. Birthing classes prepare you for many aspects of childbirth, including labor and delivery and taking care of the newborn.

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The baby weighs almost 4 pounds and is moving around often. The baby's skin has fewer wrinkles as a layer of fat starts to form under the skin. Between now and delivery, the will baby gain up to half their birth weight.

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Babies differ in size, depending on many factors, such as gender, the number of babies being carried, and size of the parent. Baby's overall rate growth is as important as the actual size. On average, the baby at this stage is about 18.5 inches and weighs close to 6 pounds. The brain has has been developed rapidly. Lungs are nearly fully developed. The head is usually positioned down into the pelvis by now.

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A mother's due date marks at the end of the 40th week. The delivery date is calculated using the first day of their period.